Short stress mill column gear box with joint gearbox, horizontal racks, vertical racks, horizontal vertical convertible rack (Rack can transform horizontal rack into vertical rack) are no arch rack, using four roller centripetal straightly pushing bearing, which can carry rolling pressure from all sides. All components of the mill are interchangeable, reducing the number of stocks of spare parts.
The pre-adjusted performance of mill is well (to achieve symmetrical adjustment), roll changing fast, low production costs, yield high.